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CVE-2021-22946

Published: 15 September 2021

A user can tell curl >= 7.20.0 and <= 7.78.0 to require a successful upgrade to TLS when speaking to an IMAP, POP3 or FTP server (`--ssl-reqd` on the command line or`CURLOPT_USE_SSL` set to `CURLUSESSL_CONTROL` or `CURLUSESSL_ALL` withlibcurl). This requirement could be bypassed if the server would return a properly crafted but perfectly legitimate response.This flaw would then make curl silently continue its operations **withoutTLS** contrary to the instructions and expectations, exposing possibly sensitive data in clear text over the network.

Notes

AuthorNote
mdeslaur
introduced by:
https://github.com/curl/curl/commit/ec3bb8f727405 and
https://github.com/curl/curl/commit/c5ba0c2f544653

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
curl
Launchpad, Ubuntu, Debian
impish
Released (7.74.0-1.3ubuntu2)
jammy
Released (7.74.0-1.3ubuntu2)
bionic
Released (7.58.0-2ubuntu3.15)
focal
Released (7.68.0-1ubuntu2.7)
hirsute
Released (7.74.0-1ubuntu2.3)
trusty
Released (7.35.0-1ubuntu2.20+esm8)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream Needs triage

xenial
Released (7.47.0-1ubuntu2.19+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N